build: slim down the docker container (#60)

Co-authored-by: Ushie <ushiekane@gmail.com>

Dockerfile

@@ -1,14 +1,34 @@
-FROM python:3.11-slim
-
-ARG GITHUB_TOKEN
-ENV GITHUB_TOKEN $GITHUB_TOKEN
+## Build dependencies
+FROM python:3.11-slim as dependencies
 
 WORKDIR /usr/src/app
 
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+COPY requirements.txt .
+
+RUN pip install -r requirements.txt
+
+## Image
+FROM python:3.11-slim
+
+WORKDIR /usr/src/app
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV PATH="/opt/venv/bin:$PATH"
+
+COPY --from=dependencies /opt/venv /opt/venv
 COPY . .
 
-RUN apt update && \
-    apt-get install build-essential libffi-dev libssl-dev openssl --no-install-recommends -y \
-    && pip install --no-cache-dir -r requirements.txt
+CMD docker/run-backend.sh
+HEALTHCHECK CMD docker/run-healthcheck.sh
 
-CMD [ "python3", "-m" , "sanic", "app:app", "--fast", "--access-logs", "--motd", "--noisy-exceptions", "-H", "0.0.0.0"]
+EXPOSE 8000